A metal fitting welding device

CN123000338APending Publication Date: 2026-10-30CANGXIAN SHUNAN METAL PRODUCTS CO LTD
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Patent Information

Application Number
CN202611165585.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-03
Publication Date
2026-10-30

AI Technical Summary

Technical Problem

[0003]金属焊接后通常需要进行打磨,打磨可以去除焊接过程中产生的飞溅物、夹渣、未焊透等可能导致应力集中的缺陷,从而提高焊缝的疲劳强度,预防裂纹产生,传统的焊接设备不具备打磨功能,需要通过后续工序进行再次加工,导致工作效率低下

Benefits of technology

[0016]本发明公开了以下技术效果:本发明通过焊接模块负责完成金属配件的焊接作业,夹持模块用于稳定固定待加工的金属配件并可带动配件旋转调整焊接角度,打磨模块用于对焊接完成后的焊缝进行打磨处理,同时收集打磨过程中产生的焊渣废料。

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Abstract

This invention discloses a metal fitting welding device, relating to the field of metal welding technology. The welding module includes a robotic arm with a welding torch mounted on it. The clamping module includes a platform with baffles symmetrically fixedly connected to it. Hydraulic rods are fixedly connected to the baffles, and a clamping mechanism is fixedly connected to the output end of each hydraulic rod. The clamping mechanism is slidably connected to the platform and is used to clamp the metal fittings. The grinding module includes a connecting seat with an L-shaped plate fixedly connected to it. A disc is rotatably connected to the L-shaped plate, and several grinding mechanisms are circumferentially mounted on the disc. Grinding wheels are mounted on each grinding mechanism, and a waste collection mechanism is provided on the L-shaped plate. This invention uses the welding module to complete the welding operation of the metal fittings, the clamping module to stably fix the metal fittings to be processed and to rotate the fittings to adjust the welding angle, and the grinding module to grind the weld after welding and collect the welding slag waste generated during the grinding process.
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Description

Technical Field

[0001] This invention relates to the field of metal welding technology, and in particular to a metal fitting welding apparatus. Background Technology

[0002] Metal fittings refer to various blocks, rods, tubes, etc., made of metal materials. Welding is a common process for joining metal parts. Welding is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure, and it is widely used in the processing of metal fittings.

[0003] Metal welding usually requires grinding. Grinding can remove defects such as spatter, slag inclusions, and incomplete penetration generated during the welding process, which may cause stress concentration, thereby improving the fatigue strength of the weld and preventing cracks. Traditional welding equipment does not have grinding function, and it needs to be processed again in subsequent processes, resulting in low work efficiency.

[0004] Therefore, there is an urgent need for a metal fitting welding device to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a metal fitting welding device to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a metal fitting welding device, comprising... A welding module, the welding module including a robotic arm on which a welding torch is mounted; A clamping module includes a platform, a bracket fixedly connected to the bottom surface of the platform, baffles symmetrically fixedly connected to the platform, hydraulic rods fixedly connected to the baffles, and a clamping mechanism fixedly connected to the output end of the hydraulic rods. The clamping mechanism is slidably connected to the platform and is used to clamp metal parts. A grinding module includes a connecting base, an L-shaped plate fixedly connected to the connecting base, a disc rotatably connected to the L-shaped plate, a plurality of grinding mechanisms circumferentially mounted on the disc, grinding wheels mounted on the grinding mechanisms, each grinding wheel being of a different model, and a waste collection mechanism provided on the L-shaped plate for collecting welding slag generated during grinding of the welding joint.

[0007] Optionally, the clamping mechanism includes a movable plate fixedly connected to the output end of the hydraulic rod, a first motor fixedly connected to the movable plate, and a clamping member fixedly connected to the output shaft of the first motor, the clamping member being used to clamp metal parts.

[0008] Optionally, a slider is fixedly connected to the bottom of the movable plate, guide rails are symmetrically provided on the platform, and pulleys are symmetrically installed at the bottom of the slider. The pulleys are located inside the guide rails and are tactilely connected to the guide rails.

[0009] Optionally, the grinding mechanism includes a mounting frame, the grinding wheel is rotatably connected to the mounting frame, a protective cover is provided on the outside of the grinding wheel, the protective cover is fixedly connected to the mounting frame, a second motor is fixedly connected to one side of the mounting frame, the output shaft of the second motor is fixedly connected to the grinding wheel, and a limit block is fixedly connected to the top of the mounting frame, the limit block is detachably connected to the disc.

[0010] Optionally, the disc has a plurality of through holes, and the plurality of through holes are correspondingly provided with a plurality of mounting brackets. The top of the mounting bracket is located in the through hole and is slidably connected to the through hole. Limiting holes are provided on both sides of the through hole, and the limiting block is detachably connected to the limiting hole by bolts.

[0011] Optionally, an extension plate is symmetrically fixedly connected to the L-shaped plate, and a locking screw is detachably connected to the extension plate, the locking screw being threadedly connected to the disc.

[0012] Optionally, the waste collection mechanism includes a hollow plate fixedly connected to the L-shaped plate, one end of the hollow plate is connected to a waste collection box, the other end of the hollow plate is connected to a connecting pipe, the end of the connecting pipe away from the hollow plate is connected to a negative pressure collection box, the negative pressure collection box is fixedly connected to the connecting seat, and the waste collection box is located below the grinding wheel.

[0013] Optionally, two movable rods are fixedly connected to the L-shaped plate, and a connecting plate is fixedly connected to the bottom surface of the platform. The movable rods pass through the connecting plate and are slidably connected to the connecting plate. A spring is sleeved on the outside of the movable rod. One end of the spring is fixedly connected to the L-shaped plate, and the other end of the spring is fixedly connected to the connecting plate.

[0014] Optionally, handles are symmetrically fixedly connected to the L-shaped plate.

[0015] Optionally, the bottom of the connecting seat is symmetrically equipped with casters.

[0016] The present invention discloses the following technical effects: The present invention uses a welding module to complete the welding operation of metal parts, a clamping module to stabilize and fix the metal parts to be processed and can drive the parts to rotate to adjust the welding angle, and a grinding module to grind the weld after welding and collect the welding slag waste generated during the grinding process. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the platform of the present invention; Figure 3 For the present invention Figure 2 A structural diagram from another perspective; Figure 4 This is a schematic diagram of the grinding module of the present invention; Figure 5 This is a schematic diagram of the structure of the disk of the present invention; Figure 6 This is a schematic diagram of the structure of the extension plate of the present invention; In the diagram: 1. Robotic arm; 2. Welding torch; 3. Platform; 4. Support; 5. Baffle; 6. Connecting seat; 7. Moving wheel; 8. Moving plate; 9. Hydraulic rod; 10. First motor; 11. Clamping component; 12. Guide rail; 13. Slider; 14. Waste collection box; 15. Hollow plate; 16. Connecting plate; 17. Moving rod; 18. Spring; 19. Negative pressure collection box; 20. Connecting pipe; 21. Handle; 22. L-shaped plate; 23. Limiting block; 24. Disc; 25. Second motor; 26. Grinding wheel; 27. Protective cover; 28. Mounting bracket; 29. ​​Limiting hole; 30. Extension plate; 31. Locking screw. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1 to 6 As shown, this embodiment provides a metal fitting welding device, including... The welding module includes a robotic arm 1, on which a welding torch 2 is mounted. The clamping module includes a platform 3, a bracket 4 fixedly connected to the bottom surface of the platform 3, baffles 5 symmetrically fixedly connected to the platform 3, hydraulic rods 9 fixedly connected to the baffles 5, and a clamping mechanism fixedly connected to the output end of the hydraulic rods 9. The clamping mechanism is slidably connected to the platform 3 and is used to clamp metal parts. The grinding module includes a connecting base 6, an L-shaped plate 22 fixedly connected to the connecting base 6, a disc 24 rotatably connected to the L-shaped plate 22, several grinding mechanisms circumferentially mounted on the disc 24, and grinding wheels 26 mounted on the grinding mechanisms. Each grinding wheel 26 has a different model. A waste collection mechanism is provided on the L-shaped plate 22 to collect the welding slag generated during the grinding of the welding joint.

[0021] The robotic arm 1 in the welding module is a six-axis industrial robotic arm 1, installed on one side of the platform 3. The end effector of the robotic arm 1 is equipped with a welding torch 2. The welding torch 2 can be selected as an argon arc welding torch 2 or a carbon dioxide shielded welding torch 2 according to the welding requirements. The robotic arm 1 can drive the welding torch 2 to complete welding operations at multiple positions and angles through a preset programming path, adapting to the welding requirements of metal parts of different shapes. The platform 3 is a rectangular metal worktable. The bottom surface of the platform 3 is fixedly connected to the bracket 4 by bolts to ensure the overall stability of the platform 3. Two vertically set baffles 5 are distributed parallel to each other on the left and right sides of the platform 3. A hydraulic rod 9 is horizontally fixedly connected to the inner wall of each baffle 5. The output ends of the two hydraulic rods 9 are set opposite each other. The output ends of the hydraulic rods 9 are fixedly connected to a clamping mechanism, which is used to clamp the metal parts to be welded. The connecting seat 6 in the grinding module is a box-shaped metal seat with an open bottom. An L-shaped plate 22 is fixedly connected to the connecting seat 6. The L-shaped plate 22 is composed of horizontal and vertical sections welded together. The disc 24 is a circular metal disc. The disc surface of the disc 24 is parallel to the surface of the horizontal section of the L-shaped plate 22. Four grinding mechanisms are evenly installed on the disc 24. Each grinding mechanism is equipped with a grinding wheel 26. The four grinding wheels 26 are coarse grinding wheel, medium grinding wheel, fine grinding wheel and polishing wheel, which can sequentially complete the coarse grinding, medium grinding, fine grinding and polishing of the weld. There is no need to frequently change the grinding wheel 26, which greatly improves the grinding efficiency.

[0022] This invention uses a welding module to complete the welding of metal parts, a clamping module to stabilize and fix the metal parts to be processed and to rotate the parts to adjust the welding angle, and a grinding module to grind the weld after welding and collect the welding slag waste generated during the grinding process.

[0023] Further refining the scheme, the clamping mechanism includes a movable plate 8 fixedly connected to the output end of the hydraulic rod 9, a first motor 10 fixedly connected to the movable plate 8, and a clamping member 11 fixedly connected to the output shaft of the first motor 10. The clamping member 11 is used to clamp metal parts.

[0024] Specifically, the movable plate 8 is a vertically arranged rectangular metal plate. The outer wall of the movable plate 8 is fixedly connected to the first motor 10 by bolts. The output shaft end of the first motor 10 is fixedly connected to the clamping member 11. The clamping member 11 adopts a chuck structure, which can adapt to the clamping requirements of shaft and disc metal parts of different diameters. After clamping is completed, the first motor 10 can drive the clamping member 11 to rotate at a uniform speed, thereby driving the clamped metal parts to rotate, which facilitates the welding torch 2 to complete the continuous welding operation of the annular weld.

[0025] Further refining the design, a slider 13 is fixedly connected to the bottom of the movable plate 8, and guide rails 12 are symmetrically provided on the platform 3. Pulleys are symmetrically installed at the bottom of the slider 13, and the pulleys are located inside the guide rails 12 and are tactilely connected to the guide rails 12.

[0026] Specifically, a slider 13 is fixedly connected to the bottom of the movable plate 8 by welding. Two parallel guide rails 12 are symmetrically opened on the upper surface of the platform 3. The guide rails 12 adopt an embedded T-slot structure. Two pulleys are symmetrically installed at the bottom of the slider 13. The pulleys are located inside the T-slots of the guide rails 12 and are in rolling connection with the bottom of the grooves of the guide rails 12. When the hydraulic rod 9 pushes the movable plate 8 to move, the pulleys can greatly reduce the frictional resistance during the movement, ensuring the smooth and stable clamping action. At the same time, the guide rails 12 can limit the movement path of the movable plate 8 to avoid deviation during the clamping process.

[0027] Further refining the design, the grinding mechanism includes a mounting frame 28, a grinding wheel 26 rotatably connected to the mounting frame 28, a protective cover 27 on the outside of the grinding wheel 26, the protective cover 27 being fixedly connected to the mounting frame 28, a second motor 25 being fixedly connected to one side of the mounting frame 28, the output shaft of the second motor 25 being fixedly connected to the grinding wheel 26, and a limit block 23 being fixedly connected to the top of the mounting frame 28, the limit block 23 being detachably connected to the disc 24.

[0028] Specifically, the central shaft of the grinding wheel 26 is rotatably connected to the mounting bracket 28 via a bearing. An arc-shaped protective cover 27 is provided on the outer side of the grinding wheel 26, and the protective cover 27 is fixedly connected to the mounting bracket 28 by bolts. This protects against flying welding slag during grinding, preventing operators from being accidentally injured by flying debris. The output shaft of the second motor 25 is fixedly connected to the central shaft of the grinding wheel 26 via a coupling. When the second motor 25 operates, it drives the grinding wheel 26 to rotate at high speed to complete the grinding operation. The limiting block 23 is a rectangular metal block, and the limiting block 23 is detachably connected to the disc 24, facilitating the adjustment of the position of the grinding wheel 26.

[0029] Further refining the design, the disc 24 has several through holes, which are correspondingly set with several mounting brackets 28. The top of the mounting bracket 28 is located inside the through hole and is slidably connected to the through hole. Limiting holes 29 are opened on both sides of the through hole, and the limiting block 23 is detachably connected to the limiting hole 29 by bolts.

[0030] Specifically, the disc 24 has four through holes corresponding to the grinding mechanism. The size of the through holes is adapted to the upper outer contour of the mounting bracket 28. The top of the mounting bracket 28 passes through the through holes and slides through the inner wall of the through holes. Limiting holes 29 are provided on both sides of the through holes. The limiting block 23 has corresponding bolt holes. The limiting block 23 is detachably connected to the disc 24 by bolts passing through the limiting holes 29. When the grinding wheel 26 needs to be used, the bolts can be loosened to adjust the mounting bracket 28 to move outward in the through holes. After adjustment, the bolts can be tightened to fix the position. When not in use, the mounting bracket 28 is located inside the through holes, so that the grinding wheel 26 is located inside the edge of the disc 24, improving safety performance.

[0031] Further refining the design, an extension plate 30 is symmetrically fixedly connected to the L-shaped plate 22, and a locking screw 31 is detachably connected to the extension plate 30. The locking screw 31 is threadedly connected to the disc 24.

[0032] Specifically, two extension plates 30 are distributed on the left and right sides of the disc 24 respectively. Locking screws 31 are threadedly connected to the extension plates 30. The end of the locking screws 31 passes through the extension plates 30 and is threadedly connected to the threaded hole on the edge of the disc 24. When the disc 24 is rotated to rotate the required grinding wheel 26 to the working position, the two locking screws 31 are tightened to lock the disc 24 firmly, preventing the disc 24 from rotating unexpectedly during the grinding process and ensuring the stability of the grinding operation.

[0033] Further refining the scheme, the waste collection mechanism includes a hollow plate 15 fixedly connected to the L-shaped plate 22. One end of the hollow plate 15 is connected to a waste collection box 14, and the other end of the hollow plate 15 is connected to a connecting pipe 20. The end of the connecting pipe 20 away from the hollow plate 15 is connected to a negative pressure collection box 19. The negative pressure collection box 19 is fixedly connected to the connecting seat 6, and the waste collection box 14 is located below the grinding wheel 26.

[0034] Specifically, the L-shaped plate 22 is equipped with a waste collection mechanism to collect welding slag generated during grinding and welding. The hollow plate 15 is a rectangular cavity with a hollow interior. The top of the waste collection box 14 has a long, narrow suction port located directly below the grinding wheel 26. The connecting pipe 20 is a corrugated telescopic pipe. The negative pressure collection box 19 is equipped with a negative pressure fan and a filter element. The negative pressure collection box 19 is fixedly connected to the side wall of the connecting seat 6 by bolts. Under the action of negative pressure suction, the welding slag generated during grinding enters the hollow plate 15 through the suction port, preventing welding slag from splashing everywhere and polluting the working environment.

[0035] To further refine the design, two movable rods 17 are fixedly connected to the L-shaped plate 22, and a connecting plate 16 is fixedly connected to the bottom surface of the platform 3. The movable rods 17 pass through the connecting plate 16 and are slidably connected to the connecting plate 16. A spring 18 is sleeved on the outside of the movable rods 17. One end of the spring 18 is fixedly connected to the L-shaped plate 22, and the other end of the spring 18 is fixedly connected to the connecting plate 16.

[0036] Specifically, two horizontally fixed moving rods 17 are symmetrically fixedly connected to the horizontal section of the L-shaped plate 22. The axis of the moving rods 17 is parallel to the length direction of the platform 3. The rod body of the moving rod 17 passes through the guide hole on the connecting plate 16 and is slidably connected to the connecting plate 16. The moving rods 17 play a guiding role, so that the L-shaped plate 22 moves linearly in a fixed direction. When not in use, the spring 18 can prevent the L-shaped plate 22 from moving towards the platform 3, which improves the safety of operation and prevents the grinding module from affecting the welding work.

[0037] The design is further refined, with handles 21 symmetrically fixedly connected to the L-shaped plate 22.

[0038] Specifically, two handles 21 are distributed on both sides of the L-shaped plate 22, providing the operator with good leverage points. When grinding is required, the operator holds the handles 21 to push the L-shaped plate 22 to move, adjust the distance between the grinding wheel 26 and the weld, adapt to the grinding position requirements of metal parts of different sizes, until the grinding wheel 26 contacts the weld. When not in use, the L-shaped plate 22 is moved away from the platform 3 by the reverse force of the spring 18, so as not to affect the normal operation of the welding work.

[0039] The design was further refined, with casters 7 symmetrically installed at the bottom of the connecting seat 6.

[0040] Specifically, the movable wheel 7 is a universal wheel with brakes, which can move the entire grinding module freely. When the grinding module is not needed, it can be pushed to one side of the device and placed against the side to avoid obstructing the welding work space and improve the flexibility of the device.

[0041] Working principle: First, the metal parts to be welded are fixed on the clamping mechanism of platform 3. The hydraulic rods 9 on both sides are activated to push the moving plates 8 to move towards each other, so that the two metal parts come into contact. Then, the robotic arm 1 of the welding module is activated to control the welding gun 2 to move to the welding position and start welding operations on the metal parts. During the welding process, the first motor 10 can be activated to drive the metal parts to rotate and complete continuous welding at different positions. After welding is completed, the entire grinding module is moved to the weld position, the disc 24 is rotated to align the coarse grinding wheel with the weld, the locking screw 31 is tightened to fix the disc 24, the second motor 25 is activated to drive the grinding wheel 26 to rotate, and the negative pressure collection box 19 is activated at the same time. The welding slag generated by grinding is sucked into the waste collection box 14 in time. By switching different types of grinding wheels 26 in sequence, the entire process of coarse grinding, medium grinding, fine grinding and polishing of the weld can be completed.

[0042] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A metal fitting welding device, characterized in that: include A welding module, the welding module including a robotic arm (1) on which a welding torch (2) is mounted; The clamping module includes a platform (3), a bracket (4) is fixedly connected to the bottom surface of the platform (3), baffles (5) are symmetrically fixedly connected to the platform (3), a hydraulic rod (9) is fixedly connected to the baffle (5), and a clamping mechanism is fixedly connected to the output end of the hydraulic rod (9). The clamping mechanism is slidably connected to the platform (3) and is used to clamp metal parts. The grinding module includes a connecting seat (6), an L-shaped plate (22) fixedly connected to the connecting seat (6), a disc (24) rotatably connected to the L-shaped plate (22), a plurality of grinding mechanisms are circumferentially installed on the disc (24), and grinding wheels (26) are installed on the grinding mechanisms. Each grinding wheel (26) has a different model. A waste collection mechanism is provided on the L-shaped plate (22) for collecting welding slag generated during grinding of the welding joint.

2. The metal fitting welding device according to claim 1, characterized in that: The clamping mechanism includes a movable plate (8) fixedly connected to the output end of the hydraulic rod (9), a first motor (10) fixedly connected to the movable plate (8), and a clamping member (11) fixedly connected to the output shaft of the first motor (10). The clamping member (11) is used to clamp metal parts.

3. The metal fitting welding device according to claim 2, characterized in that: The bottom of the movable plate (8) is fixedly connected to a slider (13), and the platform (3) is symmetrically provided with guide rails (12). The bottom of the slider (13) is symmetrically equipped with pulleys, which are located inside the guide rails (12) and are tumblingly connected to the guide rails (12).

4. The metal fitting welding device according to claim 1, characterized in that: The grinding mechanism includes a mounting frame (28), the grinding wheel (26) is rotatably connected to the mounting frame (28), a protective cover (27) is provided on the outside of the grinding wheel (26), the protective cover (27) is fixedly connected to the mounting frame (28), a second motor (25) is fixedly connected to one side of the mounting frame (28), the output shaft of the second motor (25) is fixedly connected to the grinding wheel (26), and a limit block (23) is fixedly connected to the top of the mounting frame (28), the limit block (23) is detachably connected to the disc (24).

5. The metal fitting welding device according to claim 4, characterized in that: The disc (24) has several through holes, and the several through holes are correspondingly arranged with several mounting brackets (28). The top of the mounting bracket (28) is located inside the through hole and is slidably connected to the through hole. Limiting holes (29) are opened on both sides of the through hole. The limiting block (23) is detachably connected to the limiting hole (29) by bolts.

6. The metal fitting welding apparatus according to claim 4, characterized in that: An extension plate (30) is symmetrically fixedly connected to the L-shaped plate (22), and a locking screw (31) is detachably connected to the extension plate (30). The locking screw (31) is threadedly connected to the disc (24).

7. The metal fitting welding device according to claim 1, characterized in that: The waste collection mechanism includes a hollow plate (15) fixedly connected to the L-shaped plate (22). One end of the hollow plate (15) is connected to a waste collection box (14), and the other end of the hollow plate (15) is connected to a connecting pipe (20). The end of the connecting pipe (20) away from the hollow plate (15) is connected to a negative pressure collection box (19). The negative pressure collection box (19) is fixedly connected to the connecting seat (6), and the waste collection box (14) is located below the grinding wheel (26).

8. The metal fitting welding device according to claim 1, characterized in that: Two movable rods (17) are fixedly connected to the L-shaped plate (22). A connecting plate (16) is fixedly connected to the bottom surface of the platform (3). The movable rods (17) pass through the connecting plate (16) and are slidably connected to the connecting plate (16). A spring (18) is sleeved on the outside of the movable rods (17). One end of the spring (18) is fixedly connected to the L-shaped plate (22), and the other end of the spring (18) is fixedly connected to the connecting plate (16).

9. The metal fitting welding device according to claim 1, characterized in that: Handles (21) are symmetrically fixedly connected to the L-shaped plate (22).

10. The metal fitting welding apparatus according to claim 1, characterized in that: The bottom of the connecting seat (6) is symmetrically equipped with movable wheels (7).